"Investigative reports raise questions about the partisan motives and actions of the Commission," the senators wrote.

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They added that the panel has "ignored numerous requests" from lawmakers seeking to clarify its activities.

Senators want the GAO to look into any federal funds that have been directed to the panel as well as what work the commission has done on voter participation and protection for voter information.

The Democratic lawmakers also want to know what methods the commission is using to draw any conclusions and how it is obeying rules governing its activities.

The senators are asking GAO to complete the investigation within six months of the panel's termination. Under Trump's executive order, the commission can run for two years, unless the president extends it, or 30 days after it gives its final report to Trump, whichever occurs first.

Trump created the commission by executive order in May to investigate his claims — presented without evidence — of widespread voter fraud in last year's presidential election.

But it's been beset by lawsuits and controversy, including a widely rejected request that states send in voter roll data.